This is a team effort. We provide the tuning expertise, but there will more than likely be some mechanical issues that will need to be addressed by you or your mechanic along the way. We suggest starting with a vehicle that is in good running condition.

The log review process is designed to get the most out of your car based on your modifications. Generally, the first review will be used to identify any mechanical issues present and to address fueling. Issues that were not noticeable at stock levels generally become apparent with increased performance. Namely boost/vac leaks, MAF issues, or other sensor issues. We will provide as much information as possible on how to address anything we see in the logs but these issues will need to be addressed. Upgraded turbos and aftermarket parts increase the odds that we'll chase additional mechanical issues, thus the additional log reviews.

Once mechanical issues are addressed we can move on to the fun stuff and fine tuning. Ensuring that your vehicle is in excellent condition will help you get the most from your tune. Please look over our pre-tuning checklist.

Motoza PS (Performance Suite) requires a USB port and a Windows PC (Windows 7, 8, 8.1, 10, 11 are supported).  A 1-3 amp battery maintainer should be used while flashing your vehicle, especially for the first flash.

Every build is custom tuned, so the timeline can vary between cars. In general, the goal is to be dialed in within 3-7 revisions depending on the tune. On average, the entire process can be completed within a few weeks. However, this time frame is subjective, as some customers are able to actively send files and logs regularly while others can only devote a few weekend hours to the process. With the exception of big turbo tunes which are quoted based on complexity, each tune comes with a set number of log reviews to be completed within 6 (six) months of initial setup.

We can pause this six month time frame for major repairs, deployed military personnel, or for family emergencies if you let us know in advance that you would like to pause your review clock and keep us updated of your planned date to resume tuning.

We make every effort to complete setups and log reviews within 1-3 business days of submission. However, as this is a custom service, lead time may be longer depending on your build, if that's the case, we will let you know. We schedule setups and revisions in the order they are received.

The TL;DR version is 

  1. We won't support injectors purchased from eBay, Amazon, Ali Express, or similar sites
  2. Modified injectors need to come with a detailed flow report
  3. Anything over 1000cc needs to come from Fuel Injector Clinic, DeatschWerks, or Injector Dynamics.

Critical sensors should also not come from the sites above. Save money on intercoolers and even turbos, but not fuel components and sensors. We also wouldn't trust $300.00 DSG replacements from the site that ships in smiley-faced boxes.

We'll be honest, it wasn't something we wanted to implement but since 2020 the injector market has been a bit of a mess. The sites listed above don't really vet quality or reviews, so the number of scams has gone up exponentially. We've had clients test "550cc" injectors that flowed less than OEM injectors, we've seen supposedly flow matched injectors come in with a 29% variance. We had to fire a modifier that supplied a lot of other retailers.

We have a list of trusted suppliers. The major European parts retailers are on it, so are some competitors, and so are some other retailers like USRT. We will happily send it to you. Very soon, we'll have a more comprehensive post on the topic.

Yes, we accept returns of unused, uninstalled merchandise within 30 days. We cannot accept returns on installed parts, are happy to warranty defective items. Restocking and/or labor fees apply for tunes that have been created and revised and verification that the ECU has been returned to stock condition is required.

Please see the Warranty and Terms Page for complete information.

Delivery times will vary based on location and shipping method chosen. We ship most items USPS Priority and we ship insured. We'll send you tracking information with your welcome email. 3-5 business days is average to most US destinations. If you require expedited shipping,  please get in touch!

Orders over $650.00 USD require a signature for delivery.

Shipping is from Colorado, USA. If your order is received by noon MST Monday-Friday, it will usually ship the same or next day. Generally we do not ship to PO boxes, but if you live in Alaska or are active duty military, please contact us. If we have proper ID we can make arrangements in some cases.

International orders may take longer to ship due to processing requirements and we encourage clients outside the US to email us before placing their order to get an accurate shipping quote. We suggest DHL, UPS, or FedEx outside the US and Canada. USPS does a decent job getting to larger metro areas in Canada, (though they struggle in Quebec), but if you are not a city dwelling Canadian, we suggest UPS.

Once your tune is purchased, we will create a user account for you, (we'll send you a link with your order confirmation). Our user portal allows you to send and receive files as well as host all your tuning files in one convenient place.

We recommend leaving email notifications enabled for the portal so you are alerted when new files are uploaded for you. This account does not opt you in to any marketing emails, you will just received file notifications.

Your tune files will remain on the user portal for two years after the project is complete.  Logs may be removed more regularly. Tune files that have been removed from the site can be requested via email by the original, verified purchaser. Please note that some files may be stored off site, so retrieval may take a few days in some cases. Accounts can be reactivated if needed, so don't panic, we'll help you out.


Absolutely! That's why we're here. At Motoza, loyal customers only pay an upgrade fee or the difference between the tune they have and the tune they need up to K04 and Hybrid K04 builds. Big Turbo upgrades are quoted on a case by case basis and prices are determined based on supporting modifications.

Just making some hardware changes? No problem! We offer reworks based on complexity. In general, fuel pumps and intercoolers will not require an update to the tune. After set up, if hardware changes are needed, let us know. Some changes, particularly those that affect fueling will incur a fee. If you made an honest mistake on your hardware sheet, don't worry, we're not monsters and will work with you.

We can fully control all major engine parameters and accommodate projects ranging from a bone stock Stage 1 tune through "just shy of a standalone" big turbo projects. We are happy to tune for quality aftermarket injectors, oversized or blow through MAFs, cams, TB's, etc...although some of these may affect pricing depending on the tuning stage. We've tried to lay it all out in the product descriptions, but if you're unsure, just ask.

If you compete in a racing class that requires you to limit modifications or maintain a specific power level, let us know. We can keep you where you need to be for the class in which you compete. Similarly, if you have horsepower goals but aren't sure what hardware you need to get there, let's chat.




The kit includes the MX-USB interface (USB to OBD-II), and the Motoza Performance Suite software, which reads/writes the files to your ECU, performs data logging, and acts as a diagnostic tool. Also included is the expertise of our tuners who will build your file and revise it over the course of tuning. The bulk of your tune cost is for the time and labor of your tuner. Each state comes with a set number of log reviews. And of course, a nifty Motoza sticker that's good for at least 4 horsepower.


Generally, no, unless you choose to purchase an upgrade such as Multi-Tune.

Certain hardware changes do incur additional fees during the tuning process. If your build sheet changes drastically during the tuning process, there may be a fee. If you let us know what changes you plan to make from your original build sheet, we can let you know if it's included or help you find the most economical solution.

Hardware changes that may incur an additional fee during the tuning process include but are not limited to:

  • Upgraded turbos, (for example, if you replace a K03 with another K03, there is no charge. If you replace a K03 with a K04, an upgrade to the appropriate tuning stage is usually required).
  • Fueling components such as injectors, changes to return fueling on returnless vehicles or, water methanol not specified on your build sheet. If you think you made a mistake on your build sheet, just let us know and we'll discuss options.
  • MAF sensor changes
  • MAP sensor changes

If minor hardware changes are made within your revision window of 6 months while you still have log reviews available, or at the suggestion of our tuners to address a mechanical issue, there is no fee for the change.
Tuner suggestions, like a change to the turbo size, MAP sensors, or major fueling changes, in an effort to further increase performance, are generally not covered. This is not an exhaustive list so, please contact us to make sure your planned hardware change is covered.

Yes and no.

We like for our customers to have the freedom to buy the parts they thing are best suited to their car and their needs. That said, the biggest restriction we have is about where your injectors and critical sensors come from. See the bullet points below and the Injector Policy question above.

This is a (sorta) quick run down of the tuning stages with some detailed notes regarding Stage 1+ and Stage2. You can also look over the full description of the tuning stage you plan to buy for more information.

Stage 1 is for vehicles with stock fueling and stock turbos and the price assumes basic bolt-ons. Upgraded intercooler? no problem. Upgraded fueling on a 1.8/2.7T means a move to at least Stage 1+. 2.0T FSI  vehicles with an upgraded HPFP jump to stage Stage 2 or 2+.

Stage 1+ is for vehicles with upgraded fueling and the stock turbo. On 1.8T and 2.7T this means upgraded injectors and/or fuel pressure. If you want to jump to injectors larger than 550cc on your 1.8T or 2.7T right out of the gate because you have future big turbo plans, we can generally accommodate that on tcars. See the bullet points below.

Stage 2 or Stage 2+ upgraded HPFP internals move you into Stage 2. Upgraded HPFP AND injectors takes you to 2+.

For TT225 AMU, and Model year 2000 A4, GTI, GLI, Beetle, and Passat  owners through model year 2001, 1+ covers up to 550cc injectors on the stock half megabyte ECU. Stage 1+ can absolutely include vehicles converted to wideband.

  • 1.8T & 2.7T Stage 1+  Injectors larger than 550cc and up to 1000cc (depending on the brand), are covered with the tune cost if they are purchased through us. With injectors from other reputable sources there would be an upcharge of $50-$100 to include them.
    Want to use injectors you bought off eBay or Amazon? No. Just no. Or we can give it a shot but expect to hold up the tuning process and then send them off for testing to someone reputable; this will likely put you beyond the usual number of log reviews.
    We will gladly provide a list of companies who test injectors, and provide ACCRUATE, usable data. Most of the bigger names in aftermarket Euro parts sell quality injectors.

    OEM Bosch 386cc injectors or Bosch 440 Green Giants can be used on 1+ cars with gasoline or WMI, (they are not sufficient for E85 use). We will work with with Siemens 630cc, but they may incur an additional charge and are not the ideal choice, particularly with E85 due to their spray pattern. Items such as upgraded fuel pumps, return fuel conversions, and upgraded FPRs are included in 1+ pricing.1.8T vehicles that utilized a narrowband O2 sensor and/or 1/2 MB ECU are limited to 550cc injectors.

    (On most supported models, the 1/2 Mb ECUs are found  on model year 2000, although the TT and Beetle used the smaller half megabyte ECU up to 2002. Outside North America the same is true for the S3, some Polos, and Seat and Skoda models, but the year ranges are a bit different).

  • 2.0T When it comes to HPFP internals, we will work with most of them assuming they came from a reputable source. And yes, that even includes some other tuning companies. Again, Amazon and eBay are not reputable sources for most parts.

If you've started in with block modifications beyond rods, have made MAF or MAP changes and are still running a stock turbo, talk to us first.

Hybrid K04 - Stock Block This is for any turbo with a K04 sized compressor housing, including BorgWarner K04s. If you have a TT225, this covers FrankenTurbo, TTE, or any K04 sized turbo with larger than stock internals that is not a direct OEM replacement. Standard bolt-ons like intercoolers, exhausts, 3" MAF housing with the OEM sensor, complete TT225 or VR6 MAFs. We just really need to know your exact MAF setup. Rods, cams, head swaps, other MAF setups and 3bar MAP sensors move you up a tier.

Hybrid K04 - Built Block If you've upgraded rods, installed mild aftermarket cams, gone to an AEB head or otherwise modified the block without upgrading cams or the throttle body, this covers any K04 sized turbo with those mods.

Hybrid K04 - Heavily Modified Block This is where you land if you've done block mods and 3bar MAP sensor with the addition of aggressive cams or have a blow-through or MAFless setup. More than likely you're getting ready for a significantly larger turbo. Probably a good idea to email us at this point.

Turbo Only Hybrid K04 options for TT225, Golf R, S3 and TTS - Pretty much just what it sounds like. This is for clients who replaced the OEM K04 with a hybrid and are not looking for increased performance or who just want Stage 1 performance levels.

Big Turbo - This is for any turbo larger than a K04. A built bottom end is a really stellar idea. Most turbos larger than a GTRS will REQUIRE upgraded rods, especially if E85 is involved. Pricing is by quote. If you submit a quote request wanting to hit 500 wheel horsepower on a stock block 1.8T, we will likely assume you are trolling. If you would like to send us an email and discuss what it takes to meet your power goals on any of the platforms we support, we will gladly make suggestions. If you have big power goals and need to complete your build in phases due to budget, we can tune in phases. Just talk to us.

All Stages - Ok, this brings us to the more difficult part of the conversation. There are definitely things that CAN be done, but whether they SHOULD be done or if the stock ECU, stock block, stock fuel system, etc. is a good place to do them, is an entirely different matter. There are things that can be done but cost more. There are things that work if you have the time and money to rebuild between every race but may not if you don't. There are some things we just won't do. There are so many options we can't possibly cover all of them here. The bottom line is that we encourage you to chat with our friendly staff about your particular situation before adding or removing parts.

Our Stage 1+ tunes are intended for turbos that were stock to the vehicle. In the case of the Audi TT225, for example, we skip Stage 1 and go directly to 1+ since the stock turbo was a K04.

If you've upgraded your turbo from the stock K03 to an OEM K04 turbo, the Hybrid K04 tune encompasses OEM K04s installed on vehicles that came stock with a K03, or bundle options are available. If you have a TT225 that came with a K04, the 1+ covers the OEM BorgWarner turbo or direct replacement, but not hybrids. Please see the question above for a full rundown.

If you've replaced the OEM turbo on your 1.8T with a K04 due to budget constraints and just need to prevent the overboost that comes with a K04, we can usually help. Same with cases where a K04 turbo has been used on a K03 car with stock injectors and simple bolt-ons, Stage 1 may be an option, just chat with us first.

If you have a K04 and injectors that aren't stock, the K04 tune is the one you need.

Typically tunes completed with the following number of log reviews:

Stage 1: 1-3

Stage 1+: 1-4

Hybrid K04: 5-7

Big Turbo: 5-10

A log review will not always result in a revision/new file but does mean that a tuner thoroughly reviewed your data log and that revision time was used. In this case you will receive a detailed email regarding hardware. If there is a mechanical issue that needs to be addressed, we will let you know and may suggest that you take your vehicle to an experienced mechanic if we see the same issue repeatedly.

We are big fans of DIY, it's at the heart of American racing, so please understand the suggestion to see a mechanic does not mean that we think you're not awesome with cars; it means that sometimes people who do highly specialized work every day will ultimately save you time and money, have the proper tools, and give you a better shot at success. You probably don't want your family doctor performing your heart transplant. Doesn't mean they're not an excellent physician, just that some things need specialists.

One size rarely fits all.

In many cases, a Stage 1 or 1+ or 2 just needs the base file. We encourage a log review to make sure that there's nothing left on the table and to make sure that you 15+ year old car is fueling as it should. With cars that are rapidly approaching antique status in some states, we think it's a little silly to expect that they will all respond the same to tuning.

Single owner, lovingly kept cars are one thing, but that's not the majority of 1.8s and 2.7s and early 2.oT FSIs.

To start, we've always believed in supporting enthusiasts who DIY; that's at our very core as a company. We also believe in getting the best parts you can. For a lot of folks that means collecting parts as you can before diving into install. Budget, time, etc. may not make picking everything up at once a practical option. For some, getting the best parts means a mix of brands and manufacturers when it comes to their mods. Still for others that means that if you have the head off to do rods, you might as well do the valvetrain and throw in some cams! A lot of these variants are enough to make even a quality off the shelf file feel a bit...off. Kits and spec'ed modifications can be great, they remove a hefty stack of variables especially paired with professional install. We tune for a ton of them, but they are not the solution for everyone.

As time has passed we've seen a number of hybrid turbo manufacturers come and go. With so many hybrids on the market and with the variance that exists within some manufacturers's turbos, there are even more variables. That's why we start K04s off a bit mild. There's nothing quite like the overboost that comes from a cranked wastegate no one knew about, and we assume you prefer not to do engine damage. We also assume you want to get all you can out of your modifications safely. An iterative approach works well for this.

Our 1.8T Big Turbo tunes started off as a basic GTRS tune. Shortly after release we were being asked to support all types of non-standard modifications for people not ready to jump to stand alone engine management or just wanting to do something different than the standard Stage 3.

Along the way we've had the pleasure of meeting some wonderful people and building relationships rather than just making sales.


Absolutely! They can be used if you want to make some changes to essentially the same build or if a few years go by and your car develops an issue that you'd like help diagnosing.

Single Log Review: $50.00

Minor Rework or 2 Reviews: $99.00 This is for changes like intakes, upgraded intercooler, upgraded fuel pumps, or rods with no additional block mods that do not require file changes to work, but alter performance once installed.

Rework or 3 Review Pack: $120.00. This covers changes that require file updates prior to installation (most injectors, new MAF housing with the stock sensor, increased fuel pressure, 3bar MAP sensors). For a rework this includes the setup and 2 log reviews. In many cases this can cover multiple hardware changes, but please talk to us about your plans so we can ensure that you're not moving into Major Rework territory.

Major Rework: By Quote, starts at $150. This is for situations where the turbo stays the same but we're dealing with multiple variables that affect overall vehicle operation. For example, if you're changing injectors, throttle body, MAP, and MAF all at the same time, that's more involved than new injectors and an intercooler.

All options give offer 90 days to complete the included reviews. If you need more than 90 days to complete the process, contact us and we will be happy to help you find the best option for your situation.